"No sooner is the prayer of Elijah ended than flames of fire, like brilliant flashes of lightning, descend from heaven upon the upreared altar, consuming the sacrifice, licking up the water in the trench, and consuming even the stones of the altar. The brilliancy of the blaze illumines the mountain and dazzles the eyes of the multitude. In the valleys below, where many are watching in anxious suspense the movements of those above, the descent of fire is clearly seen, and all are amazed at the sight. It resembles the pillar of fire which at the Red Sea separated the children of Israel from the Egyptian host. PK 152.4"
"Then the fire of the Lord fell, and consumed the burnt sacrifice, and the wood, and the stones, and the dust, and licked up the water that was in the trench."
EGW directly describes the events in 1 Kings 18:38, including the fire consuming the sacrifice, wood, stones, and water.